Shailene Woodley Was "Self-Conscious About Being Skinny," Didn't Have Her First Kiss Until Age 15

"I just haven't met anyone where I was like, 'Wow I could definitely see myself spending a season of my life with you,'" the 22-year-old says in the April 2014 issue of Marie Claire. Woodley takes it a step further, adding, "I don't even know if humans are genetically made to be with one person forever."

Woodley's interest in the opposite sex didn't manifest until around 2007. "I was the latest bloomer there ever was," she explains. "I was still playing with Barbies at 14 and didn't have my first kiss until 15-and-a-half. He had big, beautiful lips, and I was like, 'I don't know what I'm going to do with those.'"

The actress, who starred on ABC Family's The Secret Life of the American Teenager from 2008 to 2013, is glad those days are behind her. "My whole life I've been so self-conscious about being skinny. And just recently I don't care anymore. All insecurities are projected because of what you think others are saying about you, but they don't really matter at all," Woodley says. "My only real insecurities in high school were having such long legs and thick hair—things I'm so very grateful for now."

That being said, Woodley recognizes the value in being young and hopeful.

"I think there's this big rise right now in giving teenagers the worth they have. For so long they were— and still are—depicted in movies and TV shows as codependent whiners or rich, beautiful, diamond-clad daughters or dumb cheerleader types," she says. "But teenagers are so smart. I was probably smarter as a 16-year-old than I am today. There is a zest for life that you have at that age that is so beautiful."

Woodley might seem mature for her age, but she's not doing learning. "For the first time, I feel like I'm entering my womanhood," she explains. "I've decided to take a few months off, just to see who I am as that woman in the world, because I've never been able to experience it outside of this industry."

The actress' profile has been on the rise ever since she co-starred with George Clooney in 2011's The Descendants, but Woodley hasn't let fame go to her head. "I don't pay any attention to the fan thing, because I think it's a very strange culture nowadays. People have always been fans of people, but I can't relate to any of these girls or boys who scream. It's idolizing someone you don't know," she tells Marie Claire. "None of these people know me."

Unlike many of her famous peers, Woodley rarely tweets. "The whole social media thing is just a little too weird for me," she says of using various platforms to connect with fans. "We're all such narcissists, and that's what social media caters to. Our society conditions us to be our own planets, which is great. Independent thinking is so important. But we expect everyone around us to be our moons."